Revealing the effect of electrocatalytic performance boost during hydrogen evolution reaction on free-standing SWCNT film electrode

Abstract Large-scale sustainable hydrogen production by water electrolysis requires a highly active yet low-cost hydrogen evolution reaction (HER) electrocatalyst. Conductive carbon nanomaterials with high surface areas are promising candidates for this purpose. In this contribution, single-walled c...

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Autores principales:	Karolina Kordek-Khalil, Dawid Janas, Piotr Rutkowski
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/cd06ef0aa71a4112aa1f86bd50ec097a
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spelling	oai:doaj.org-article:cd06ef0aa71a4112aa1f86bd50ec097a2021-12-02T18:01:40ZRevealing the effect of electrocatalytic performance boost during hydrogen evolution reaction on free-standing SWCNT film electrode10.1038/s41598-021-99458-82045-2322https://doaj.org/article/cd06ef0aa71a4112aa1f86bd50ec097a2021-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-99458-8https://doaj.org/toc/2045-2322Abstract Large-scale sustainable hydrogen production by water electrolysis requires a highly active yet low-cost hydrogen evolution reaction (HER) electrocatalyst. Conductive carbon nanomaterials with high surface areas are promising candidates for this purpose. In this contribution, single-walled carbon nanotubes (SWCNTs) are assembled into free-standing films and directly used as HER electrodes. During the initial 20 h of electrocatalytic performance in galvanostatic conditions, the films undergo activation, which results in a gradual overpotential decrease to the value of 225 mV. Transient physicochemical properties of the films at various activation stages are characterized to reveal the material features responsible for the activity boost. Results indicate that partial oxidation of iron nanoparticles encapsulated in SWCNTs is the major contributor to the activity enhancement. Furthermore, besides high activity, the material, composed of only earth-abundant elements, possesses exceptional performance stability, with no activity loss for 200 h of galvanostatic performance at − 10 mA cm−2. In conclusion, the work presents the strategy of engineering a highly active HER electrode composed of widely available elements and provides new insights into the origins of electrocatalytic performance of SWCNT-based materials in alkaline HER.Karolina Kordek-KhalilDawid JanasPiotr RutkowskiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Karolina Kordek-Khalil Dawid Janas Piotr Rutkowski Revealing the effect of electrocatalytic performance boost during hydrogen evolution reaction on free-standing SWCNT film electrode
description	Abstract Large-scale sustainable hydrogen production by water electrolysis requires a highly active yet low-cost hydrogen evolution reaction (HER) electrocatalyst. Conductive carbon nanomaterials with high surface areas are promising candidates for this purpose. In this contribution, single-walled carbon nanotubes (SWCNTs) are assembled into free-standing films and directly used as HER electrodes. During the initial 20 h of electrocatalytic performance in galvanostatic conditions, the films undergo activation, which results in a gradual overpotential decrease to the value of 225 mV. Transient physicochemical properties of the films at various activation stages are characterized to reveal the material features responsible for the activity boost. Results indicate that partial oxidation of iron nanoparticles encapsulated in SWCNTs is the major contributor to the activity enhancement. Furthermore, besides high activity, the material, composed of only earth-abundant elements, possesses exceptional performance stability, with no activity loss for 200 h of galvanostatic performance at − 10 mA cm−2. In conclusion, the work presents the strategy of engineering a highly active HER electrode composed of widely available elements and provides new insights into the origins of electrocatalytic performance of SWCNT-based materials in alkaline HER.
format	article
author	Karolina Kordek-Khalil Dawid Janas Piotr Rutkowski
author_facet	Karolina Kordek-Khalil Dawid Janas Piotr Rutkowski
author_sort	Karolina Kordek-Khalil
title	Revealing the effect of electrocatalytic performance boost during hydrogen evolution reaction on free-standing SWCNT film electrode
title_short	Revealing the effect of electrocatalytic performance boost during hydrogen evolution reaction on free-standing SWCNT film electrode
title_full	Revealing the effect of electrocatalytic performance boost during hydrogen evolution reaction on free-standing SWCNT film electrode
title_fullStr	Revealing the effect of electrocatalytic performance boost during hydrogen evolution reaction on free-standing SWCNT film electrode
title_full_unstemmed	Revealing the effect of electrocatalytic performance boost during hydrogen evolution reaction on free-standing SWCNT film electrode
title_sort	revealing the effect of electrocatalytic performance boost during hydrogen evolution reaction on free-standing swcnt film electrode
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/cd06ef0aa71a4112aa1f86bd50ec097a
work_keys_str_mv	AT karolinakordekkhalil revealingtheeffectofelectrocatalyticperformanceboostduringhydrogenevolutionreactiononfreestandingswcntfilmelectrode AT dawidjanas revealingtheeffectofelectrocatalyticperformanceboostduringhydrogenevolutionreactiononfreestandingswcntfilmelectrode AT piotrrutkowski revealingtheeffectofelectrocatalyticperformanceboostduringhydrogenevolutionreactiononfreestandingswcntfilmelectrode
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Revealing the effect of electrocatalytic performance boost during hydrogen evolution reaction on free-standing SWCNT film electrode

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